Ground Segment HAMTV standard

Transcription

1 Ground Segment HAMTV standard Florence HamFest April 12, 2014

2 HamTV transmitter

3 Space Station Reference Coordinate Systems ISS Program Revision F 2001 NASA -JSC Columbus Module

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5 Trajectory Operations Officer - TOPO

6 Attitude Determination and Control Officer - ADCO

7 ARISS Patch Antennas 41 & 43 Columbus Module -ISS #41 #43

8 ARISS Patch Antennas41 & 43 Columbus Module-ISS

9 ARISS Patch Antennas 41 & 43 Columbus Module -ISS #43 #41

10 ARISS Patch Antennas 41 & 43 Columbus Module -ISS

11 HAMTV Standard GS Antenna Feed Preamplifier/Down Converter RF Coax Cable 1.2 m Offset Dish LHCP Helix Kuhne KU LNC-25 LMR-400 Set Top Box / PC Card Megasat HD 800 / TechnoTrend S Each Ground Station will operate as a receive-only (R/O) terminal i.e. the station can receive, demodulate and record data transmitted in the S-band( MHz). The antenna used for data reception consists of an offset focus system with azimuth and elevation mount; it is capable of program controlled operation, however manual capability as backup solution is foreseen as well.

12 HAMTV Standard GS Orbitron + Modified WiSP + Tioune Suite

13 Level Chart for HAMTV

14 HamTV Standard Station: 1.2m Offset Dish [25dBi]

15 HamTV Ground Station K.I. -Livorno

16 G/T measurement and Rotator setup Sun Flux: 138 SFU at 2.4 GHz at April 2, 2014, 1200 San Vito MHz 2395 MHz 2422 MHz 2437 MHz y (db) G/T db(1/k)

17 HamTV standard Ground Station Receiving HamTV F6DZP has developed Tioune SW suite to monitor and manage Techno Trend Boards S1600 and S3200. Tioune Data Reader is part of the SW suite.

18 Different Antenna solutions

19 Fixed Helix Antenna Tested by IZ8YRR

20 Fixed Helix Antenna

21 60 Off-Nadir angle 55 = 9 (#43) SR = 2.0 MSym/s 50 G/T = 2.0 db(1/k) Effects of the onboard antenna Off-Nadir Angle for a pass with MaxElevation= Eb/N0 [db] Time [s] QEF threshold Range [km]

22 60 Off-Nadir angle 55 = 9 (#43) SR = 2.0 MSym/s 50 G/T = 2.0 db(1/k) Effects of the onboard antenna Off-Nadir Angle for a pass with MaxElevation= Eb/N0 [db] Time [s] 4 : LOT AOT Range [km] -240

23 60 Off-Nadir 55 angle = 9 (#43) SR = 1.3 MSym/s G/T = dB(1/K) Effects of the onboard antenna Off-Nadir Angle for a pass with MaxElevation= Eb/N0 [db] Time [s] 5 : Range [km]

24 60 Off-Nadir 55angle = 9 & 13 SR = 1.3 MSym/s G/T = dB(1/K) Effects of the onboard antenna Off-Nadir Angle for a pass with MaxElevation= Eb/N0 [db] Time [s] Range [km]

25 Comparison between Nadir and Off-Nadir pointing antennas: Best performances with Off-Nadir mounting, which exploites maximum gain at larger ranges. 60 Off-Nadir 55angle = 0 & 13 SR = 1.3 MSym/s G/T = db(1/k) Eb/N0 [db] :31 0 Time [s] 5 :05 Max El.= Range [km]

26 The effects of the off-nadir orientation of on-board ARISS-41 and ARISS-43 antennas Conclusions Off-Nadir mounting increases link duration From this point of view the 13 (#41 TBC) is the best 13 offset antenna allows MSym/sand 40 pass, using a HAMTV standard station. i.e. 1.2 m, G/T=2.0 db(1/k) 13 offset antenna allows MSym/sand 40 pass, using a HAMTV standard station. i.e. 1.2 m, G/T=2.0 db(1/k) Higher passes allows longer duration, but impose stronger constrain on tracking (greater Az. Speed). A 64 pass allows 5 :03 and 5 :52 respectively.

27 Measured RF performances during commissioning step 1 Signal monitoring with the R&S FSV Spectrum Analyzer Frequency: 2369 M1 Symbol Rate: 1.3 MS/s C/N> 30 db

28 Measured RF performances during commissioning Live TV reception with the TT-3200 (Matera #1) Frequency: 2395 MHz Symbol Rate: 2 MS/s MER: 31 db

29 Measured RF performances during commissioning Our model prediction: commissioning step 2, 12:44:20 UTC, Matera station. C/N =44.5 db at 2.0 MSymb/s, Off-Nadir 9, range 625 km, G/T=25.7 db(1/k) G/T of Matera RX was measured the day before using Cassiopeia A as a calibrated noise source 35 C/N [db] Time [s] Range [km]

30 Matera Laser Ranging Observatory facility ( HamTV commissioning steps 1&2)

31 One of the first proposed examples of chained stations (from Document AMSAT Italy GSO R1.1, 13/04/ 2012)

32 Chaining Groundstations location of present ground stations in Europe (range 700 Km)

33 The original presentation was given by Amsat-Italia HamTV team at the ARISS International Meeting in ESA ESTEC April 3-5, 2014

34 Thankyou! On behalf of Amsat-Italia Fabio Azzarello